Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Summary of Assets and Liabilities Measured at Fair Value

December 31, 2018	Total		Level 1		Level 2		Level 3
Assets
Futures	$	851,529	$	851,529	$	—	$	—
Total assets	$	851,529	$	851,529	$	—	$	—
Liabilities
Futures	$	757,896	$	757,896	$	—	$	—
Total liabilities	$	757,896	$	757,896	$	—	$	—
December 31, 2017	Total		Level 1		Level 2		Level 3
Assets
Futures	$	710,148	$	710,148	$	—	$	—
Options purchased		51,625		51,625		—		—
Total assets	$	761,773	$	761,773	$	—	$	—
Liabilities
Futures	$	522,665	$	522,665	$	—	$	—
Options written		23,000		23,000		—		—
Total liabilities	$	545,665	$	545,665	$	—	$	—